OVMS3-idf/components/esp32/hwcrypto/sha.c

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/*
* ESP32 hardware accelerated SHA1/256/512 implementation
* based on mbedTLS FIPS-197 compliant version.
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*
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
* Additions Copyright (C) 2016, Espressif Systems (Shanghai) PTE Ltd
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* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
/*
* The SHA-1 standard was published by NIST in 1993.
*
* http://www.itl.nist.gov/fipspubs/fip180-1.htm
*/
#include <string.h>
#include <sys/lock.h>
#include "hwcrypto/sha.h"
#include "rom/ets_sys.h"
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static _lock_t sha_lock;
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void esp_sha_acquire_hardware( void )
{
/* newlib locks lazy initialize on ESP-IDF */
_lock_acquire(&sha_lock);
ets_sha_enable();
}
void esp_sha_release_hardware( void )
{
/* Want to empty internal SHA buffers where possible,
need to check if this is sufficient for this. */
SHA_CTX zero = { 0 };
ets_sha_init(&zero);
ets_sha_disable();
_lock_release(&sha_lock);
}
/* Generic esp_shaX_update implementation */
static void esp_sha_update( esp_sha_context *ctx, const unsigned char *input, size_t ilen, size_t block_size)
{
/* Feed the SHA engine one block at a time */
while(ilen > 0) {
size_t chunk_len = (ilen > block_size) ? block_size : ilen;
ets_sha_update(&ctx->context, ctx->context_type, input, chunk_len * 8);
input += chunk_len;
ilen -= chunk_len;
}
}
void esp_sha1_init( esp_sha_context *ctx )
{
bzero( ctx, sizeof( esp_sha_context ) );
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}
void esp_sha1_free( esp_sha_context *ctx )
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{
if ( ctx == NULL ) {
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return;
}
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bzero( ctx, sizeof( esp_sha_context ) );
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}
void esp_sha1_clone( esp_sha_context *dst, const esp_sha_context *src )
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{
*dst = *src;
}
/*
* SHA-1 context setup
*/
void esp_sha1_start( esp_sha_context *ctx )
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{
ctx->context_type = SHA1;
esp_sha_acquire_hardware();
ets_sha_init(&ctx->context);
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}
/*
* SHA-1 process buffer
*/
void esp_sha1_update( esp_sha_context *ctx, const unsigned char *input, size_t ilen )
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{
esp_sha_update(ctx, input, ilen, 64);
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}
/*
* SHA-1 final digest
*/
void esp_sha1_finish( esp_sha_context *ctx, unsigned char output[20] )
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{
ets_sha_finish(&ctx->context, ctx->context_type, output);
esp_sha_release_hardware();
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}
/* Full SHA-1 calculation */
void esp_sha1( const unsigned char *input, size_t ilen, unsigned char output[20] )
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{
esp_sha_context ctx;
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esp_sha1_init( &ctx );
esp_sha1_start( &ctx );
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esp_sha1_update( &ctx, input, ilen );
esp_sha1_finish( &ctx, output );
esp_sha1_free( &ctx );
}
void esp_sha256_init( esp_sha_context *ctx )
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{
bzero( ctx, sizeof( esp_sha_context ) );
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}
void esp_sha256_free( esp_sha_context *ctx )
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{
if ( ctx == NULL ) {
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return;
}
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bzero( ctx, sizeof( esp_sha_context ) );
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}
void esp_sha256_clone( esp_sha_context *dst, const esp_sha_context *src )
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{
*dst = *src;
}
/*
* SHA-256 context setup
*/
void esp_sha256_start( esp_sha_context *ctx, int is224 )
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{
if ( is224 == 0 ) {
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/* SHA-256 */
ctx->context_type = SHA2_256;
esp_sha_acquire_hardware();
ets_sha_init(&ctx->context);
} else {
/* SHA-224 is not supported! */
ctx->context_type = SHA_INVALID;
}
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}
/*
* SHA-256 process buffer
*/
void esp_sha256_update( esp_sha_context *ctx, const unsigned char *input, size_t ilen )
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{
if( ctx->context_type == SHA2_256 ) {
esp_sha_update(ctx, input, ilen, 64);
}
/* SHA-224 is a no-op */
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}
/*
* SHA-256 final digest
*/
void esp_sha256_finish( esp_sha_context *ctx, unsigned char output[32] )
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{
if ( ctx->context_type == SHA2_256 ) {
ets_sha_finish(&ctx->context, ctx->context_type, output);
esp_sha_release_hardware();
} else {
/* No hardware SHA-224 support, but mbedTLS API doesn't allow failure.
For now, zero the output to make it clear it's not valid. */
bzero( output, 28 );
}
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}
/*
* Full SHA-256 calculation
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*/
void esp_sha256( const unsigned char *input, size_t ilen, unsigned char output[32], int is224 )
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{
esp_sha_context ctx;
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esp_sha256_init( &ctx );
esp_sha256_start( &ctx, is224 );
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esp_sha256_update( &ctx, input, ilen );
esp_sha256_finish( &ctx, output );
esp_sha256_free( &ctx );
}
/////
void esp_sha512_init( esp_sha_context *ctx )
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{
memset( ctx, 0, sizeof( esp_sha_context ) );
}
void esp_sha512_free( esp_sha_context *ctx )
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{
if ( ctx == NULL ) {
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return;
}
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bzero( ctx, sizeof( esp_sha_context ) );
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}
void esp_sha512_clone( esp_sha_context *dst, const esp_sha_context *src )
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{
*dst = *src;
}
/*
* SHA-512 context setup
*/
void esp_sha512_start( esp_sha_context *ctx, int is384 )
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{
if ( is384 == 0 ) {
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/* SHA-512 */
ctx->context_type = SHA2_512;
} else {
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/* SHA-384 */
ctx->context_type = SHA2_384;
}
esp_sha_acquire_hardware();
ets_sha_init(&ctx->context);
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}
/*
* SHA-512 process buffer
*/
void esp_sha512_update( esp_sha_context *ctx, const unsigned char *input, size_t ilen )
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{
esp_sha_update(ctx, input, ilen, 128);
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}
/*
* SHA-512 final digest
*/
void esp_sha512_finish( esp_sha_context *ctx, unsigned char output[64] )
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{
ets_sha_finish(&ctx->context, ctx->context_type, output);
esp_sha_release_hardware();
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}
/*
* Full SHA-512 calculation
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*/
void esp_sha512( const unsigned char *input, size_t ilen, unsigned char output[64], int is384 )
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{
esp_sha_context ctx;
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esp_sha512_init( &ctx );
esp_sha512_start( &ctx, is384 );
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esp_sha512_update( &ctx, input, ilen );
esp_sha512_finish( &ctx, output );
esp_sha512_free( &ctx );
}
////